Bolt



UNITED STATES PATENT OFFICE.

THOMAS I). THOMAS, OF YOUNGSTOWN, OHIO, ASSIGNOB OF ONE-THIRD TO WALTER D. MCKAY AND ONE-THIRD TO THOMAS L. THOMAS.

BOLT.

Specification of Letters Patent.

Patented Dec. 13, 1921.

Application filed February 19, 1921. Serial No. 446,411.

two parts, one of which I have designated as the main part, and the other as the key or looking part.

Figure l is a View, partially in section, showing the application of my invention in actual use.

Fig. 2 illustrates the two parts of my bolt in juxtaposition, but not assembled in operative relation.

Fig. 3 is a fragmentary view, partially in section, showing the inner face of the head of the bolt as being slightly beveled or oval, to permit the insertion of a tool for extracting purposes. i

Fig. 4: is an end view, partially in section, drawn on line l4c, Fig. 1.

Fig. 5 is a view similar to Fig. a, but

illustrating the bolt as being angular in cross-section instead of circular, as otherwise illustrated and described.

Fig. 6 shows a slight modification or variation in the outline of the main part of my belt.

B represents the main part of my bolt, the shank or stem of which is substantially of semi-circular formation in cross-section (as shown in the drawings,) as at (L, except that adjacent its inner end it is gradually enlarged into substantially circular forma tion, as at 7), thus forming an inwardly curved or concave section 0.

K represents the key or locking part of my bolt, and is similar in formation to the main part B, except that at its inner end, instead of being enlarged into circular formation, it is gradually cut away or tapered, thus forming an outwardly curved or convex section (.3.

The operation of my device is obvious.

After passing the main part B of the bolt through the objects which are to be fastened together, indicated by e and 7, and through the shoring g of the proper thickness, the

locking part K of the bolt is inserted, with its fiat face or surface adjacent the similar surface of the main part, and when the inner point (Z of the locking part strikes the beginning of the concave section 0 on the main part, this inner point will be forced graduallyoutward beyond the longitudinal plane of the circumference of the bolt, thus locking and securing the two or more objects c and 7 firmly together, as plainly shown in Fig. 1.

If desired, the inner face of the bolt head may be slightly cut away, as shown in Fig. 3, for the purpose of inserting a tool to extract the bolt.

While I have illustrated and described my bolt or pin as being circular in cross-section, it is, of course, obvious that it will be equally practical to make it angular in crosssection, as shown in Fig. 5.

Also. instead of the inwardly curved or concave section 0, this section may occupy a straight inclined plane, as shown at h, Fig. 6.

I claim 1. A bolt or pin formed in two parts, the shank or stem of one part being substantially semi-circular in cross-section, except that its inner end is enlarged into substantially circular formation, the enlarged portion curving inwardly and merging into the flat face of the semi-circular portion of the shank; the other part being of similar formation, except that its inner end is curved or tapered from its fiat surface outwardly toward its oval surface.

2. A bolt or pin formed in two parts, the shank or stem of one part being substantially semi-circular in cross-section, except that its inner end is gradually enlarged outwardly, from its flat surface, forming an inwardly curved or concave section; the other part being of similar formation, except that its inner end is curved outwardly, or cut away, forming an outwardly curved or convex section.

3. A bolt or pin formed in two parts, the shank or stem of one part being less than a complete circle in cross-section, except that its inner end is enlarged into substantially circular formation, the enlarged portion curving inwardly and merging into the fiat face of the smaller portion; the other part being of proper size and shape in cross-section to form a body substantially circular in crosssection when joined with the first described part, except that its inner end is i curved or tapered from its flat surface outwardly toward its oval surface.

4. A bolt or pin formed in twoparts the shank or stem of one part being less than a complete circle in cross-section, and adjacent its inner end being gradually enlarged outwardly from its flat surface, forming an in- Wardly curved or concave section; the other part being of proper size and shape 1n crosssection toform a body substantially circu- 7 is curved outwardly, or cut away; forming an outwardly curved or convex section. V 15 In testimony whereof I hereunto aflix my signature in the presence of two Witnesses.

THOR AS n THOMAS.

Witnesses Anion MOGINN, CLARA HINDsoN, 

